package chapter05.ac9;

import chapter03.example09.Example09;

public class Ac9 {
    private static final int TIMES =100000;
    public static void main(String[] args) {
        chapter05.ac9.Ac9.testString();
        chapter05.ac9.Ac9.testStringBuffer();
        chapter05.ac9.Ac9.testStringBuilder();
    }
    public static void testString(){
        long startTime =System.currentTimeMillis();
        String str ="";
        for (int i=0;i<TIMES;i++){
            str +="test";
        }
        long endTime = System.currentTimeMillis();
        System.out.println("String test usedtime:"+(endTime-startTime));
    }
    public static void testStringBuffer(){
        long startTime = System.currentTimeMillis();
        StringBuffer str = new StringBuffer();
        for (int i = 0;i<TIMES;i++){
            str.append("test");
        }
        long endTime = System.currentTimeMillis();
        System.out.println("StringBuffer test usedtime:"+(endTime-startTime));
    }
    public static void testStringBuilder(){
        long startTime = System.currentTimeMillis();
        StringBuilder str = new StringBuilder();
        for (int i =0;i<TIMES;i++){
            str.append("test");
        }
        long endTime = System.currentTimeMillis();
        System.out.println("StringBuilder test usedtime:"+(endTime-startTime));
    }
}
